<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>字体间隔</title>
  <style>
    .tqjc1{
      letter-spacing: 20px;
    }
    .tqjc2{
      word-spacing: 20px;
    }
  </style>
</head>
<body>
  <div>I have a dream.天桥嘉成</div>
  <div class="tqjc1">I have a dream.天桥嘉成</div>
  <div class="tqjc2">I have a dream.天桥嘉成</div>

  
</body>
</html>